Number | Name | Date | Kind |
---|---|---|---|
1808448 | Baker | Jun 1931 | |
4681411 | Taddei | Jul 1987 | |
4904076 | Kappler et al. | Feb 1990 | |
5457506 | Winkler | Oct 1995 |
Number | Date | Country |
---|---|---|
80 22425 | Apr 1982 | FRX |
2835116A1 | Feb 1980 | DEX |
2732860C3 | Jan 1981 | DEX |
2712897C2 | Sep 1981 | DEX |
3303749A1 | Sep 1984 | DEX |
Entry |
---|
Hilco 1993 Optical Products Catalog, pp. 36, 38. |